Diane Wiessinger wrote:
>I was just asked by a LLL Leader about the safety of 1000 micrograms of =
>vitamin B12 daily for a woman who called her and who is breastfeeding a =
>2 year old and four months pregnant.  It was suggested as an alternative =
>to steroids for asthma.  Hale isn't concerned about B12, but gives the =
>usual daily supplemental dose as 25 micrograms daily - a far cry from =
>1000 micrograms.  I did find an internet source that talks about doses =
>up to 2000 micrograms daily for permicious anemia.
>
>Is there any problem with such a whopping dose, for fetus, toddler, or =
>mother?  Molecular weight is 1355, which probably helps reduce the =
>transfer into the milk. =20

Diane, my Australian nutrition textbook says that the usual 
requirement for an adult (RDI) is 2 micrograms per day. Under 
'toxicity' it says that it is very low toxicity in doses up to 1000 
times the RDI. So this would be 2000 micrograms. It didn't mention 
any concerns re babies, pregnancy, etc (whereas it does generally 
include info about these if relevant). However, this is not a 
specialist textbook for mother-child issues.

Joy
-- 
******************************************************************
Joy Anderson B.Sc. Dip.Ed. Grad.Dip.Med.Tech. IBCLC
Australian Breastfeeding Association counsellor
Perth, Western Australia.   mailto:[log in to unmask]
******************************************************************

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